Steven106, here's a link to the the 189 visa document checklist - https://www.border.gov.au/Trav/Visa-1/189-/Skilled-Independent-visa-(subclass-189)-document-checklist think that should answer your question. To note, you don't have to upload medicals and police clearance certificates at the time of application but can rather wait for the CO to request them. We frontloaded our application and got a direct grant, so can avoid delays if you want to upload them straight away. And yes, I think your brother will need to supply evidence of 'genuine' relationship with his fiancee, photos, joint bank account, emails, tenancy agreement etc.